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导通孔设计对高速信号完整性的影响 总被引:1,自引:1,他引:0
当今的高速数字电路设计中,印制板上传输线轻微的不连续问题都必须认真对待,特别是被广泛使用的导通孔。随着频率的增长和信号上升沿的变陡,导通孔带来的阻抗不连续会引起信号的反射,严重影响系统的性能和信号完整性。文章用全波电磁仿真软件HFSS,对多种导通孔结构进行了全面的研究。通过建模仿真,分析了导通孔直径,导通孔长度和多余的导通孔短柱几种关键设计参数对信号完整性的影响。此研究对高速数字设计者深入理解导通孔设计有一定意义。 相似文献
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微波多芯片组件中垂直通孔互连的矩阵束矩量法仿真 总被引:1,自引:0,他引:1
在微波多芯片组件中,处在不同层的信号传输线是通过通孔连接在一起的。由于通孔会导致信号传输的不连续性,对信号的传输至关重要。本文采用矩阵束矩量法仿真了多层电路中通孔的散射特性,并总结了通孔几何尺寸和平行导体板间距变化时通孔的散射特性所表现出来的规律。 相似文献
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通过对圆柱状结构中多层各向异性薄层吸波材料的电磁分析—柱体由金属柱芯和包围其外的多层各向同性介质材料组成,在各层之间和外表面涂覆各向异性薄层.考虑各薄层的输入阻抗,得出曲面结构内部及表面涂覆各向异性吸波材料散射场.根据级联矩阵和算法,在一定波段上进行RCS (Radar Cross Section)减缩,获令人满意的计算结果. 相似文献
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通过对圆柱状结构中多层各向异性薄层吸波材料的电磁分析-柱体由金属柱芯和包围其外的多层各向同性介质材料组成,在各层之间和外表面涂覆各向异性薄层。考虑各薄层的输入阻抗,得出曲面结构内部及表面涂覆各向异性吸波材料散射场。根据级联矩阵和算法,在一定波段上进行RCS(Radar Cross Section)减缩,获令人满意的计算结果。 相似文献
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近半个世纪以来,微波电路发展十分迅速,它经历了从低频到高频、从单层到多层的发展历程,最终导致了微波多芯片组件的产生。随着多芯片组件密度的不断提高,互连的不连续性成为制约整体性能的瓶颈。因此,对互连进行仿真和建模,对于微波多芯片组件的设计有着重要的意义。文章以MMIC芯片和介质基板的垂直互连结构作为研究对象,对不连续性结构的散射参数进行了软件仿真优化,并进行了装配、测试和结果分析。 相似文献
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Analysis of a large number of vias and differential signaling in multilayered structures 总被引:1,自引:0,他引:1
Houfei Chen Qin Li Leung Tsang Chung-Chi Huang Jandhyala V. 《Microwave Theory and Techniques》2003,51(3):818-829
A method is presented for full-wave modeling of vertical vias in multilayered circuits. The analysis of the interior problem is based upon the cylindrical wave expansion of the magnetic field Green's function. The multiple interaction among vertical vias is modeled by the Foldy-Lax scattering formula. Multilayered effects are included by using cascaded network of the single-layer components. The exterior problem of the via and the transmission line is analyzed using the method of moments approach. The exterior and interior problems are combined into a system of equations to facilitate the solution of a large number of vias. Using this approach, the scattering matrix of problems of several thousand vias can be calculated with moderate CPU and memory requirement. Numerical results have been obtained for different via configurations and for a large range of frequency. Also illustrated are results for common and differential mode in differential signaling with surrounding idle and shorting vias. 相似文献
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A full wave method is presented for modeling and analyzing multiple interactions among vertical vias in densely packaged integrated circuits and printed circuit board with ground plane of finite extent. In such structures, the TEM mode in the planar structure is excited and can propagate and cause interaction of waves among vias. Reflections will also occur at the edges of the finite ground plane. The electromagnetic analysis methodology is an extension of the previous methodology in analyzing multiple scattering among vias for infinite ground plane . The analysis is based upon the cylindrical wave mode expansion of the magnetic field Green's function, the Foldy-Lax multiple scattering formalism and utilizing the resonator modes of a circular cavity. The circular resonator modes are transformed into cylindrical waves onto the cylindrical via structures. Numerical results illustrate the physics of the underlying resonance scattering problems. We consider the cases of a) two coupled active vias of differential mode and b) two coupled vias of common mode. Results are also illustrated for ground plane resonance and the effects of shorting vias on such resonance. The effects of off-centering and the presence of idle vias are also illustrated. 相似文献
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Large-scale full-wave multiple scattering among cylindrical vias in planar waveguides is modeled using the Foldy-Lax equation. The formulation includes the skin effects of the conducting power/ground plane. Numerical solution of the Foldy-Lax equation with large number of unknowns is computed efficiently using the sparse-matrix canonical-grid method. In this method, interactions among vias are decomposed into the strong interactions part and the weak interactions part. The calculation of the weak part is carried out using two-dimensional (2-D)-fast Fourier transform (FFT) by translating the locations of the vias onto the uniform grids. The final solution of the Foldy-Lax equations is calculated by an iterative method. The results show O (N log N) CPU efficiency and O (N) memory efficiency. This makes large scale via problems possible for computer simulation. 相似文献
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在高速数字电路设计中,过孔的寄生电容、电感的影响不能忽略,过孔在传输路径上表现为阻抗不连续的断点,会产生信号的反射、延时、衰减等信号完整性问题。文章采用矢量网络分析仪研究了过孔长度、过孔孔径、焊盘/反焊盘直径对过孔阻抗的影响。通过在信号孔旁增加接地孔,为过孔电流提供回路方法,提高过孔阻抗的连续性,并有效降低过孔损耗。此外,文章还探讨了过孔多余短柱对过孔阻抗及损耗的影响。本研究可为高速数字电路过孔设计和优化提供依据。 相似文献
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Zaw Zaw Oo En-Xiao Liu Er-Ping Li Xingchang Wei Yaojiang Zhang Tan M. Le-Wei Joshua Li Vahldieck R. 《Advanced Packaging, IEEE Transactions on》2008,31(2):267-274
This paper presents a semi-analytical approach for electrical performance modeling of complex electronic packages with multiple power/ground planes and large number of vias. The method is based on the modal expansion technique and the method of moments. For the inner package domain with multiple power/ground planes and many vias, the modal expansion method is employed to compute the electromagnetic fields from which the multiport network parameters, e.g., the admittance matrix can be easily obtained. For the top/bottom domain of signal layers, the moment method is used to extract the equivalent resistance, inductance, capacitance, and conductance (RLCG) parameters. The equivalent circuit for the entire package is then generated by combining the results for both package domains. The equivalent circuit can be used in a SPICE-like simulator to study the signal and power integrity of an electronic package. Numerical examples demonstrate that the new approach is able to provide fast yet accurate signal and power integrity analysis of multilayered electronic packages. 相似文献
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提出了一种基于LTCC技术的新型高阻带抑制带通滤波器的实现方法.采用在并联谐振器的圆柱形电感之间引入感性耦合,在高阻带产生一个传输零点,并且能实现非常好的阻带衰减性能.本文对传统的梳状线带通滤波器结构进行改进,利用过孔的寄生电感效应,将过孔用作谐振杆,明显减小了器件的尺寸.并且通过利用空间耦合的寄生效应,实现滤波器的阻带高抑制传输零点,以满足了对特殊频点高抑制的要求.运用该方法设计了中心频率1.65 GHz,通带200MHz,带外2GHz处衰减大于60dBc的五级带通滤波器.实物测试结果和全波电磁仿真结果吻合较好. 相似文献